6-8 824 Reference Manual 9/29/09
•L
peak
level corresponding to the frequency weighting
selected for L
eq
(see above) and a second L
peak
level cor-
responding to one of the two alternative choices of fre-
quency weighting.
•L
n
(6 values with 0.1 dB resolution, based on user-
selected percentages with 0.1% resolution)
• Date, Time and Duration of Interval
• Average and maximum wind conditions (using external
windspeed/direction transducers)
Exceedances
The 824 can log exceedance events based on sound levels
that go over a predefined threshold. It can also be triggered
by an event which raises the level by 10 dB. This is called a
“Passby” event.
L
N
Percentiles (Broadband)
The System 824 L
N
Centiles feature provides a set of six
percentile values to be measured and shown in the “L
N
Centiles” display. Using these six settings, you can select
any six percentile values. For example, setting one of the six
settings to 10.5 would show the SPL that has been exceeded
10.5% of the time during the time of overall measurement.
These settings can each take on any value within the
following range:
.01 to 99.99
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